fix(httpauth-jwt): WithJSONNumber in Verify, JSON errors in AuthMiddleware, bump httpauth v1.0.2 (#1)

Pass jwt.WithJSONNumber() to jwt.Parse in hmacSigner.Verify, rsaSigner.Verify, and
rsaPublicVerifier.Verify. JWT numbers (including permission bitmasks) are now decoded
as json.Number instead of float64 — exact parsing for all integers including
math.MaxInt64 (the ADMIN wildcard mask). Float64 would round MaxInt64 to 2^63 and
overflow back to math.MinInt64 on cast to int64.

AuthMiddleware now calls httpauth.WriteJSONError for all 401 responses instead of
http.Error. Standardizes the error format across the full httpauth-* middleware stack:
AuthMiddleware (httpauth-jwt), EnrichmentMiddleware, and AuthzMiddleware (httpauth)
all produce {"code":"UNAUTHENTICATED"|"PERMISSION_DENIED"|"INTERNAL","message":"..."}.

Update two existing tests (TestIssueTokenPair_CustomClaims,
TestRefreshTokenPair_CustomClaimsInNewToken) to assert json.Number instead of float64
— they were correct before WithJSONNumber, now reflect the actual decoded type.

Add TestVerify_JSONNumberPreservesMaxInt64: issues a token with math.MaxInt64 as a
bitmask, verifies it, and asserts the decoded value is exactly math.MaxInt64 via
json.Number.Int64() — proving no float64 round-trip occurs.

Add TestAuthMiddleware_UnauthorizedJSON: asserts the 401 response is
Content-Type: application/json with body {"code":"UNAUTHENTICATED","message":"..."}.

Bump httpauth dependency to v1.0.2.

Reviewed-on: #1
Co-authored-by: Rene Nochebuena Guerrero <rene@nochebuena.dev>
Co-committed-by: Rene Nochebuena Guerrero <rene@nochebuena.dev>

auth.go

@@ -32,26 +32,26 @@ func AuthMiddleware(verifier Verifier, publicPaths []string) func(http.Handler)
 
 			authHeader := r.Header.Get("Authorization")
 			if !strings.HasPrefix(authHeader, "Bearer ") {
-				http.Error(w, "unauthorized", http.StatusUnauthorized)
+				httpauthmw.WriteJSONError(w, http.StatusUnauthorized, "UNAUTHENTICATED", "unauthorized")
 				return
 			}
 			tokenStr := strings.TrimPrefix(authHeader, "Bearer ")
 
 			token, err := verifier.Verify(tokenStr)
 			if err != nil {
-				http.Error(w, "unauthorized", http.StatusUnauthorized)
+				httpauthmw.WriteJSONError(w, http.StatusUnauthorized, "UNAUTHENTICATED", "unauthorized")
 				return
 			}
 
 			claims, ok := token.Claims.(jwt.MapClaims)
 			if !ok {
-				http.Error(w, "unauthorized", http.StatusUnauthorized)
+				httpauthmw.WriteJSONError(w, http.StatusUnauthorized, "UNAUTHENTICATED", "unauthorized")
 				return
 			}
 
 			uid, _ := claims["sub"].(string)
 			if uid == "" {
-				http.Error(w, "unauthorized", http.StatusUnauthorized)
+				httpauthmw.WriteJSONError(w, http.StatusUnauthorized, "UNAUTHENTICATED", "unauthorized")
 				return
 			}